The role of toxic nectar secondary compounds in driving differential bumble bee preferences for milkweed flowers
The role of toxic nectar secondary compounds in driving differential bumble bee preferences for milkweed flowers
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DOI：
10.1007/s00442-020-04701-0
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发表时间：
2020-07
期刊：
影响因子：
2.7
通讯作者：
Eris Villalona;Briana D. Ezray;Erica Laveaga;A. Agrawal;J. Ali;H. Hines
中科院分区：
文献类型：
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作者：
Eris Villalona;Briana D. Ezray;Erica Laveaga;A. Agrawal;J. Ali;H. Hines
虽然形态差异，如舌头的长度往往是作为传粉者的花卉偏好的驱动程序的特点，在化学检测和耐受性二级化合物的差异也可能发挥作用。我们试图更好地了解次要化合物在花卉偏好中的作用，通过检查大黄蜂（Bombusspp.）对马利筋花的访问，马利筋花的花蜜中可能含有有毒的强心内酯，它们最丰富最重要的传粉者我们研究熊蜂物种的常见马利筋（Asclepias syriaca）相比，在外地的其他花卉的访问和测试是否观察到的偏好可能会受到影响的避免和耐受性的cardenolides，如测量的cardenoloabain，在实验室中。我们发现，常见的马利筋主要是由一个大黄蜂的物种，熊蜂griseocollis，在一个比这个物种的丰度在社会上高得多的比例访问。我们证实了在A. Syriacanetar。实验表明，B. griseocollis，与普通熊蜂相比B.凤仙花湾bimaculatus表现出更大的对强心内酯的回避，但仅在开始诱导疾病的水平，而其他物种表现出不回避强心内酯或减少回避强心内酯，导致这些蜜蜂的疾病和死亡。毒性实验表明，B.灰核菌对强心内酯的耐受性也比B高得多。总之，这些结果支持了B.这可能涉及增加检测和耐受乳草Cardenolides的能力。
While morphological differences such as tongue length are often featured as drivers of pollinator floral preferences, differences in chemical detection and tolerance to secondary compounds may also play a role. We sought to better understand the role of secondary compounds in floral preference by examining visitation of milkweed flowers, which can contain toxic cardenolides in their nectar, by bumble bees (Bombusspp.), some of their most abundant and important pollinators. We examine bumble bee species visitation of common milkweed (Asclepias syriaca) compared to other flowers in the field and test whether observed preferences may be influenced by avoidance and tolerance of cardenolides, as measured by the cardenolide ouabain, in the lab. We reveal that common milkweed is visited predominantly by one bumble bee species,Bombus griseocollis, in a ratio much higher than the abundance of this species in the community. We confirmed the presence and toxicity of cardenolides inA. syriacanectar. Lab experiments revealed thatB. griseocollis, compared to the common bumble beesB. impatiensandB. bimaculatus, exhibit greater avoidance of cardenolides, but only at levels that start to induce illness, whereas the other species exhibit either no or reduced avoidance of cardenolides, resulting in illness and mortality in these bees. Toxicity experiments reveal thatB. griseocollisalso has a substantially higher tolerance for cardenolides thanB. impatiens.Together, these results support a potential evolutionary association betweenB. griseocollisand milkweed that may involve increased ability to both detect and tolerate milkweed cardenolides.